Buggy code:
public class Main extends JFrame implements WindowListener { private static final long serialVersionUID = 2825416147024612814L ; private JTextArea textArea ; private int currentChunk ; private int chunkSize = 10 ; private VocabList vocabList ; private ListStringGetter vocabGetter ; private VocabListGetter vlistGetter ; private JFileChooser fileChooser ; private String defaultDirectory = ".//res//" ; private boolean showAnswers = false ; private final String WRITTEN_TEST_MENU_ITEM = "written" ; private DefaultListModel < FileLink > filelinkListModel ; private VocabListTableModel vltm ; private static final String MAKE_LINK_MENU_ITEM_NAME = "link" ; private static final String DELETE_MENU_ITEM_NAME = "delete" ; private static final String ADD_BUTTON_NAME = "add" ; private static final String RECONSTRUCT_MENU_ITEM_NAME = "reconstruct" ; private static final int PRIMARY_LANGUAGE = Vocab . ENGLISH ; private JPopupMenu shortcutListPopup ; private FileLink currentLink ; public Main ( ) { } private void initializeFields ( ) { } private void makeTextArea ( ) { } private JScrollPane makeVocabTablePane ( ) { } private JTable makeVocabTable ( ) { } private JPanel makeButtonPanel ( ) { } private Collection < JButton > makeButtons ( ) { } private Collection < JMenuItem > makeMenuItems ( ) { ActionListener menuListener = new Main . MenuItemListener ( ) ; Collection < JMenuItem > menuItems = new ArrayList < JMenuItem > ( ) ; JMenuItem open = new JMenuItem ( "Open" ) ; open . setName ( "Open" ) ; open . addActionListener ( menuListener ) ; menuItems . add ( open ) ; JMenuItem createNew = new JMenuItem ( "Create<seq2seq4repair_space>new..." ) ; createNew . setName ( "create" ) ; createNew . addActionListener ( menuListener ) ; <START_BUG> menuItems . add ( open ) ; <END_BUG> JMenuItem startTest = new JMenuItem ( "Start<seq2seq4repair_space>a<seq2seq4repair_space>test" ) ; startTest . setName ( "test" ) ; startTest . addActionListener ( menuListener ) ; menuItems . add ( startTest ) ; JMenuItem written = new JMenuItem ( "Start<seq2seq4repair_space>a<seq2seq4repair_space>written<seq2seq4repair_space>test" ) ; written . setName ( WRITTEN_TEST_MENU_ITEM ) ; written . addActionListener ( menuListener ) ; menuItems . add ( written ) ; JMenuItem makeLink = new JMenuItem ( "Add<seq2seq4repair_space>a<seq2seq4repair_space>shortcut" ) ; makeLink . setName ( Main . MAKE_LINK_MENU_ITEM_NAME ) ; makeLink . addActionListener ( menuListener ) ; menuItems . add ( makeLink ) ; JMenuItem reconstruct = new JMenuItem ( "Reconstruct" ) ; reconstruct . setName ( Main . RECONSTRUCT_MENU_ITEM_NAME ) ; reconstruct . addActionListener ( menuListener ) ; menuItems . add ( reconstruct ) ; return menuItems ; } private JMenu makeMenu ( ) { } private JMenuBar makeMenuBar ( ) { } private JPanel makeShortcutPanel ( ) { } private JList < FileLink > makeShortcutPanelList ( ) { } private void makeShorcutListPopup ( JList < FileLink > links ) { } private JPanel makeMainPanel ( ) { } private void makeFrame ( ) { } public static void main ( String [ ] args ) { } private class MenuItemListener implements ActionListener { @ Override public void actionPerformed ( ActionEvent e ) { } } private class ButtonListener implements ActionListener { @ Override public void actionPerformed ( ActionEvent e ) { } } private void fillTextArea ( ) { } private void reconstructVocabFile ( File file ) { } @ SuppressWarnings ( "unchecked" ) private void getSavedLinks ( ) { } @ Override public void windowActivated ( WindowEvent e ) { } @ Override public void windowClosed ( WindowEvent e ) { } @ Override public void windowClosing ( WindowEvent e ) { } private Vocab addDialog ( ) { } @ Override public void windowDeactivated ( WindowEvent e ) { } @ Override public void windowDeiconified ( WindowEvent e ) { } @ Override public void windowIconified ( WindowEvent e ) { } @ Override public void windowOpened ( WindowEvent e ) { } }

Fix:
menuItems . add ( createNew ) ;